4.18-stable review patch. If anyone has any objections, please let me know.
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From: Stephen Boyd swboyd@chromium.org
[ Upstream commit 20edec388277b62ddfddb8b2b376a937a2cd6d1b ]
Both callers of coreboot_table_init() ioremap the pointer that comes in but they don't unmap the memory on failure. Both of them also fail probe immediately with the return value of coreboot_table_init(), leaking a mapping when it fails. The mapping isn't necessary at all after devices are populated either, so we can just drop the mapping here when we exit the function. Let's do that to simplify the code a bit and plug the leak.
Cc: Wei-Ning Huang wnhuang@chromium.org Cc: Julius Werner jwerner@chromium.org Cc: Brian Norris briannorris@chromium.org Cc: Samuel Holland samuel@sholland.org Fixes: 570d30c2823f ("firmware: coreboot: Expose the coreboot table as a bus") Signed-off-by: Stephen Boyd swboyd@chromium.org Reviewed-by: Julius Werner jwerner@chromium.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/firmware/google/coreboot_table.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/firmware/google/coreboot_table.c +++ b/drivers/firmware/google/coreboot_table.c @@ -110,7 +110,8 @@ int coreboot_table_init(struct device *d
if (strncmp(header.signature, "LBIO", sizeof(header.signature))) { pr_warn("coreboot_table: coreboot table missing or corrupt!\n"); - return -ENODEV; + ret = -ENODEV; + goto out; }
ptr_entry = (void *)ptr_header + header.header_bytes; @@ -137,7 +138,8 @@ int coreboot_table_init(struct device *d
ptr_entry += entry.size; } - +out: + iounmap(ptr); return ret; } EXPORT_SYMBOL(coreboot_table_init); @@ -146,7 +148,6 @@ int coreboot_table_exit(void) { if (ptr_header) { bus_unregister(&coreboot_bus_type); - iounmap(ptr_header); ptr_header = NULL; }